The old muffler had holes everywhere and a terrible drone over 45mph, so I replaced it with a DynoMax Super Turbo Muffler and a pre-bent eBay special U-tube, cut and welded to desired fitment. The name sounds way cooler then I think it should, but maybe once I remove the second set of cats, I'll get a little more sound out of it. As it is with all four cats in place, it's too quite for my liking.